Very vague and not really the best advice. Also 3. is completely wrong... An IOI is where someone shows interest in you.
iois-the-complete-list-vt12025.html
1. That's all subjective. From personal experience i've had some of the best conversations from a woman who was upset. "You look upset. Someone as pretty as you shouldn't be so sad. Are you all right?" That's all you need say. It's innocent, you're showing a care for how she's feeling and you're complimenting her. Worst case scenario she asks to be left alone in which case you wish her the best and hope she feels better then move on. Most of the time i've had it where women respond really well, sometimes they'll just want a distraction or they will just bitch about the usual("My friend is a bitch... Blah blah"). Just nod and agree, don't address her problem and talk about something completely unrelated then introduce yourself.
2. This point really doesn't need to be said as it's just about the most obvious thing you should have already known previous to pick up.
5. This only applies if you want to be the JOKER of the group. This is not always the best role to take up in a group as you're deemed the entertainer which isn't good. Your only value in such groups is entertaining them. Girls may act nicely around him and want him around but nine times out of ten you can bet your last €5 that very few -- if any -- find him sexually appealing especially when he deliberately lowers his own value in order to gain acceptance/proximity from those around him. The Joker isn't an Alpha of himself or any group. Stay away from this role at all costs!
By all means joke every now and then but don't give yourself needy nicknames like "I'm the pineapple head" and be known as the jokester.